# Homework Help: Relative velocity and rockets

1. Apr 15, 2012

### TheronSimon

1. The problem statement, all variables and given/known data

explain how relative velocity is related to the direction in which rockets are launched...

2. Apr 15, 2012

### tiny-tim

Hi TheronSimon!

Tell us what you think, and then we'll comment!

3. Apr 15, 2012

### TheronSimon

Since the earth rotates from west to east, rockets are launched from west to east This is done to aid in increasing the velocity of the rocket because the relative velocity becomes the velocity of the rocket + the velocity of the earth thus giving the rocket a higher velocity. What this entails is that, the rockets have a higher velocity and so they conserve fuel which in turn helps conserve the environment and having less of an ecological foot print.

4. Apr 15, 2012

### tiny-tim

Yes, that looks good!

I think you should make this part a little clearer …
… you haven't said what the "relative velocity" is relative to (and why it matters in achieving a particular orbit).

5. Apr 15, 2012

### TheronSimon

would the relative velocity be relative to the earth? since its going into orbit?

6. Apr 16, 2012

### tiny-tim

(just got up :zzz:)

that's right!

(and the orbit is not affected by the earth's rotation )